Inter-station protection fault identification system and method based on information fusion

Abstract

The invention belongs to the technical field of electric power system fault recognition, and particularly relates to an interstation protection fault recognition system and method based on information fusion. The interstation protection fault recognition system based on information fusion is characterized by comprising a protection information uploading module, an interstation information interaction module and an information fusion action module which are connected in sequence; the protection information uploading module extracts distance protection and zero sequence current protection action messages on the basis of protection line interval output results; the interstation information interaction module calculates and sends interstation interaction information on the basis of the action messages uploaded by the information uploading module; the information fusion action module recognizes interstation faults according to the interstation interaction information and local protection action information. Accurate judgment results can be obtained for faults of various types, the protection performance is sensitive and reliable, the backup protection action time is shortened, and meanwhile the problem that protection fixed value setting is hard is successfully solved.

Description

technical field [0001] The invention belongs to the field of substation power system fault identification technology, and in particular relates to an information fusion-based inter-station protection fault identification system and a method thereof. Background technique [0002] With the access of large-scale new energy and the development of AC / DC hybrid EHV / UHV interconnected large power grids, staged protection using only local information is difficult to adapt to changing network structures and operating modes; at the same time, distributed The access of the power supply makes the distribution network change from a single-radiation network to a double-terminal or multi-terminal network. The distribution of power flow and the magnitude and flow direction of the short-circuit current during faults have fundamental changes. The original protection method based on fixed value setting has great limitations. , resulting in the sensitivity and selectivity of relay protection ca...

AI Technical Summary

Problems solved by technology

However, the current wide-area protection research is mainly aimed at the fixed grid structure, with relatively single functions, poor ability to deal with complex events and adaptability to changes in the operating environment

The industry has not yet reached a consensus on many issues regarding wide-area protection, such as whether to adopt a centralized or distributed system configuration mode, to locate faults based on electrical or logical quantities, to construct protection algorithms, etc., resulting in a huge amount of uploaded information, Problems such as complex information transmission mode and unclear information sharing mechanism

In addition, the research results mostly focus on theoretical analysis and simulation verification, and lack of consideration for engineering practicability and feasibility

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